package com.easonji.admin.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

/**
 * @ClassName: KaptchaController
 * @Description: 验证码控制器
 * @Author: LiuJun
 * @date: 2018/07/24 13:27
 * @Version: 1.0
 * @Copyright: Copyright (c) 2018 - 2019
 */
@Controller
public class KaptchaController {

    @Resource
    private Producer producer;

    /**
     * 生成验证码
     */
    @GetMapping("/kaptcha")
    public void index(HttpServletRequest request, HttpServletResponse response) {
        HttpSession session = request.getSession();
        response.setDateHeader("Expires", 0);
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma", "no-cache");
        response.setContentType("image/jpeg");
        String capText = producer.createText();
        session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
        BufferedImage bi = producer.createImage(capText);
        ServletOutputStream out = null;
        try {
            out = response.getOutputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            ImageIO.write(bi, "jpg", out);
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            try {
                out.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } finally {
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
